Lines and intersect at

MATHEMATICS · Single correct · CBSE · Mathematics · Lines and Angles · Lines and Angles

Problem

Lines

AB

and

CD

intersect at

O

. If

\angle AOC = (4y - 20)^{\circ}

and

\angle BOD = (2y + 40)^{\circ}

, find the measure of

\angle AOD

. (a)

60^{\circ}

(b)

100^{\circ}

(c)

80^{\circ}

(d)

90^{\circ}